Drug interactions
Avatrombopag + Ketoconazole
Severity: Moderate
Avatrombopag and Ketoconazole: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Ketoconazole inhibits CYP3A4 and can increase avatrombopag exposure. Excess effect may raise platelet counts and thrombotic risk.
What this interaction means in plain words
Avatrombopag and Ketoconazole can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Avatrombopag belongs to Miscellaneous; Ketoconazole belongs to Anti Fungals.
Why it happens
Inhibition of CYP3A4 (and CYP2C9 contribution) reduces avatrombopag clearance.
What to do
Use the reduced starting dose recommended in labeling for dual CYP2C9/3A4 inhibitors and monitor platelet counts.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Ketoconazole
- Alfuzosin + Ketoconazole Contraindicated
- Alprazolam + Ketoconazole Contraindicated
- Avanafil + Ketoconazole Contraindicated
- Conivaptan + Ketoconazole Contraindicated
- Dihydroergotamine intranasal + Ketoconazole Contraindicated
- Dihydroergotamine + Ketoconazole Contraindicated
Other interactions of Avatrombopag
- Amiodarone + Avatrombopag Moderate
- Amobarbital + Avatrombopag Moderate
- Avatrombopag + Bosentan Moderate
- Avatrombopag + Carbamazepine Moderate
- Avatrombopag + Enzalutamide Moderate
- Avatrombopag + Fluconazole Moderate
Frequently asked questions
Can I take Avatrombopag with Ketoconazole?
MediHelp rates the interaction as moderate. Avatrombopag and Ketoconazole can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Ketoconazole inhibits CYP3A4 and can increase avatrombopag exposure. Excess effect may raise platelet counts and thrombotic risk.
How serious is the interaction between Avatrombopag and Ketoconazole?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use the reduced starting dose recommended in labeling for dual CYP2C9/3A4 inhibitors and monitor platelet counts.
What other medicines interact with Ketoconazole?
MediHelp also lists interactions of Ketoconazole with, for example, Alfuzosin, Alprazolam, Avanafil. The full list is on the Ketoconazole page.
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